Biomedical subjects

R H Segman

Publications and source records attributed to R H Segman.

21 records · Page 2Linked to original sources

PubMed1995

Serotonin and suicidality: the impact of fluoxetine administration. II: Acute neurobiological effects.

Despite the demonstrated anti-depressant efficacy of the selective serotonin reuptake inhibitors (SSRIs), increased suicidal ideation and/or agitation have been reported in a small proportion of individuals receiving fluoxetine or other SSRIs. Part II of this review examines fluoxetine's acute effects on serotonergic functioning. Although acute fluoxetine administration produces a short-term compensatory decrease in the firing of 5-HT neurons, the neurobiological data reviewed suggests that this decrease probably does not lead to an over-compensatory net decrease in 5-HT functioning. The implications of fluoxetine's complex effects on the 5-HT systems are discussed with respect to clinical practices and future research.

Animals↗

PubMed1994

Serotonin and suicidality: the impact of acute fluoxetine administration. I: Serotonin and suicide.

The general enhancement of central serotonin (5-HT) neurotransmission following long-term administration of serotonin-selective reuptake inhibitors (SSRIs) appears to play an important role in these drugs' anti-depressant efficacy. Because suicide and/or aggression appear linked to diminished levels of brain 5-HT and its metabolites, it has been suggested that SSRIs may be particularly effective in reducing suicidality. Case reports of increased or new suicidal ideation following administration of fluoxetine and other SSRIs, however, raise questions about how these potential side effects may relate to the SSRI's acute effects on 5-HT transmission. Part I of this review examines fluoxetine's effects on suicidality and related behaviors and reviews the relationship of suicidality to serotonergic dysregulation.

Depressive Disorder↗

PubMedDate not supplied

Clinical and familial correlates of tardive dyskinesia in India and Israel.

BACKGROUND: Antipsychotic drugs are widely used for the treatment of psychosis, especially schizophrenia. Their long-term use can result at times in serious side-effects such as Tardive Dyskinesia (TD). Since over 80% of schizophrenia sufferers (lifetime prevalence 1%) receive long-term antipsychotic drug treatment, the extent of the problem is potentially large. Increasing age is the most consistently demonstrated risk factor for TD. AIMS: To assess effect of different clinical factors and demographic variables in India and Israel and sib pair concordance of Tardive Dyskinesia (TD) in India. SETTINGS AND DESIGN: The study was conducted simultaneously among Indian and Israeli subjects: ascertainment was family-based in India and hospital-based in Israel. METHODS AND MATERIAL: In India the instruments used were: Diagnostic Interview for Genetic Studies (DIGS), Positive and Negative Syndrome Scale (PANSS), Abnormal Involuntary Movement Scale (AIMS), and Simpson Angus Scale (SAS). The last three instruments were also used in Israel. STATISTICAL ANALYSIS: Regression analysis and Pearson's correlation. RESULTS AND CONCLUSIONS: TD symptoms were present in 40.4% of 151 Israeli subjects and 28.7% of 334 Indian subjects. While age at onset and total scores on PANSS were significant predictors of TD in both the samples, lower scores on the Global Assessment of Functioning Scale (GAF), diagnostic sub-group and male gender were significant predictors among Indians. There was no concordance of TD symptoms among 33 affected sib-pairs from India.

Adult↗